NGK R2349-10 are recommended by NGK but they’re a racing plug and cost about €40 each DCR9EIX are the ones recommended by NGK for the regular 996 but they’re Iridium plugs and IME iridium have never really worked well in bikes of that era. They’ll cost about €15 The bog standard DCPR9E will work just as well IMO. Cue the cam of worms opening.
- I used to get very fixated about squeezing the last possible drop of performance out of my Ducati , and would happily spend hours tuning it ( with vacuum gauges , gas analyser etc. ) But I'm getting better now ..... " on my journey to recovery " , as they say . I was also lucky enough to live 5 minutes away from 10 miles of lovely highway that had a near perfect surface , had almost no traffic and was completely Dibble-proof , because there was just nowhere for them to plot up and point the hair-drier at you ( and your wallet ) . Conclusion : I agree with WC Paul , the standard NGK plug does an excellent job .
Thank you to everyone for the info, I was under the impression the iridium would have been the better plug especially if NGK recommend them, does anyone know the reason why iridium does not work as well with older bikes? cheers
In my experience old style ignition systems can’t fire these with enough juice to prevent the plugs fouling. A modern coil over plug ignition system doesn’t have that issue. I’ve had this 1st hand on a TVR Speed6 engine which I fitted iridium plugs too, misfired like a bitch , swapping back to std copper NGKs fixed it & the same on my 900Superlight.
Thank you for your input and explanation, based on earlier info from the forum and your explanation I will be investing in the original copper plugs. Thank you to all, your the best
Well, I may offer a slightly different point of view here. I have been using NGK DCR9EIX iridium plugs on both my 1996 916s (biposto then SP3) without any issue at all. Same on my 1989 900SS (DCR8EIX). All with OEM coils. I cannot certify the engines are working any better than with standard plugs. But they certainly don’t feel or sound worse. The spark is definitely much brighter, though. Iridium plugs are also advertised with a much longer lifespan but I can’t tell if it’s actually true yet, as I have been using these for only 5 years.
Thank you for your input, I fitted iridium plugs on my 2000 R1 2 years ago, obviously not a Ducati but an older engine and the bike runs as sweet as a nut and for this reason I was going to use them on my Duc. I am a bit torn between the two now, I will do a bit more digging on both these plugs as I would like to sort it by COP today to get the bike back together and ready for the summer. Many thanks
Been there , done that .... I even went as far as to prep both sets ( gap check , clean etc ) then get gf to pick a pair without telling me , and to put each one into the plug socket for me ! BTW - did I mention that I used to get a bit obsessive about these "little details" ? Hmm ..... not really a big surprise there .... That was exactly my conclusion ..... eventually .....
@oldtech Whatever your experience was, your profile picture clearly indicates that you decided to stick with iridium. At least for your left hand.
No, after much more research along with these replies, I am going to stick with the original copper rather than risking the iridium with possible back firing etc. Thanks